Just an idea using bit vectors: create a bit vector for each small integer, 1 means the integer is present in the current quadruple. Then just do logical OR an the four vectors corresponding to the selected integers and look for zeroes.
لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re: Efficient selection mechanism? by choroba
in thread Efficient selection mechanism? by BrowserUk

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